Effects of Intubation on Intra-ocular Pressure and Optic Nerve Sheath Diameter

Inclusion Criteria: * Non-ophthalmic surgery * Mallampati I or II classifications * American Society of Anesthesiologists (ASA) I-II Exclusion Criteria: * Glaucoma, * Diabetes mellitus, * Cardiovascular diseases, * Pulmonary diseases, * ASA 3 and 4 * Body Mass Index (BMI) greater than 30 * Eye surgery * Difficult intubation (Mallampati score of 3 or 4, thyromental distance of less than 6 cm and a maximum mouth opening of less than 3 cm) * Intraocular pressure value more than 20 mmHg * More than two intubation attempts * A risk of regurgitation patients * History of obstetric surgery * Allergies to propofol, fentanyl or rocuronium